Дисертації з теми "Prosthesis simulator"
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Stokoe, Susan Marie. "A finger function simulator and surface replacement prosthesis for the metacarpophalangeal joint." Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6216/.
Повний текст джерелаRamakrishnan, Tyagi. "Asymmetric Unilateral Transfemoral Prosthetic Simulator." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5111.
Повний текст джерелаEstelle, Stephen. "Optimizing 3D Printed Prosthetic Hand and Simulator." Digital Commons at Loyola Marymount University and Loyola Law School, 2019. https://digitalcommons.lmu.edu/etd/661.
Повний текст джерелаHeying, Jamie John Gratton David G. "Flexural strength of interim fixed prosthesis materials after simulated function." [Iowa City, Iowa] : University of Iowa, 2009. http://ir.uiowa.edu/etd/377.
Повний текст джерелаHeying, Jamie John. "Flexural strength of interim fixed prosthesis materials after simulated function." Thesis, University of Iowa, 2009. https://ir.uiowa.edu/etd/377.
Повний текст джерелаSmith, Simon Lawrence. "Design, development and applications of hip joint simulators." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/1132/.
Повний текст джерелаAnissian, H. Lucas. "In vitro evaluation of hip prostheses /." Stockholm, 2001. http://diss.kib.ki.se/2001/20010420anis/.
Повний текст джерелаCampbell, Neil. "Design of a knee simulator for the testing of total knee prostheses." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/3228.
Повний текст джерелаBrăileanu, Patricia-Isabela. "Research on optimizing customized prostheses." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI062.
Повний текст джерелаThis thesis aims to develop a virtual surgery planning methodology starting from the traditional Total Hip Replacement preoperative planning and having as final goal the realization of a template prosthesis that can be customized according to the femoral landmarks of each patient. Starting from the traditional preoperative planning of THR, which is done on the patients’ X-Ray and using the same principles of obtaining femoral landmarks, the CT scans of a patient with hip joint related disease that need to undergo a THR surgery were segmented by using specific algorithms in order to extract the patients’ femur and after that was imported in dedicated CAD software in which, with the help of evaluation instruments, all the patients’ femoral landmarks were identified. These femoral landmarks were used to develop a custom prosthesis starting from a standard anatomical femoral stem, which was validated using FEA simulations. Based on the information obtained, the development of a software coded in Python language was done to create somehow a tool that allows the analysis of patients’ CT scans in MPR view, but also in 3D view. It allows the bone segmentation of the affected area in order to obtain a CAD model file and perform the virtual preoperative planning in a CAD dedicated software, and finally use some of these dimensions in order to personalize a custom hip stem based on a pre-existing stem model used as basis for the desired geometrical transformations. The work is completed by printing it with FDM technology, using a biocompatible material to demonstrate the potential of this study, the versatility and the possibility of orienting the femoral stems used in THR towards personalization and AM, avoiding the use of standard prostheses that can lead to postoperative complications and thus leading to the elimination of prostheses “banks” due to the fact that they would no longer be necessary
Lura, Derek J. "Modeling upper body kinematics while using a transradial prosthesis." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002751.
Повний текст джерелаKoelewijn, Anne D. "Predictive Simulations of Gait and Their Application in Prosthesis Design." Cleveland State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=csu1533901459119777.
Повний текст джерелаWang, Lin. "Digital prototyping of a dental articular simulator to test prosthetic components." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540870.
Повний текст джерелаChen, Spencer Chin-Yu Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "The perception and comprehension of prosthetic vison: patient rehabilitation and image processing considerations from simulated prosthetic vision psychophysics." Publisher:University of New South Wales. Graduate School of Biomedical Engineering, 2009. http://handle.unsw.edu.au/1959.4/44414.
Повний текст джерелаTatur, Guillaume. "Conception d'un système de vision par phosphènes." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20006.
Повний текст джерелаThis work falls within the broader framework of visual prostheses conception, designed for people suffering from late blindness due to degenerative diseases of retina photoreceptor cells. By stimulating certain part of the optical pathway that is still functional, it is possible to elicit visual perceptions, called phosphenes, in the subject's visual field. Recent studies on the problematic of informational content of prosthetic vision propose, in majority, a simple reduction in the resolution of grayscale images acquired from a single head worn camera. Our study proposes a new approach based on the principle of functional vision, developed in collaboration with specialists in functional rehabilitation of the ARAMAV institute. Through this innovative approach, we have defined methods for extraction and representation of scene informational content, which aim to improve autonomy in mobility and to make possible the perception of facial expressio ns. In order to evaluate these propositions, we have developed a prosthetic vision simulator, whose parameters are based on clinical trials results. For mobility, we present the usefulness of providing access to 3D information, in substitution or in addition with brightness information and the usefulness of an eye tracking device to improve and facilitate spatial knowledge acquisition. Experiments dedicated to mobility as well as some preliminary results are presented. For the recognition of facial expressions, our study provides evidence that these expressions are correctly perceived if we combined information selection and specific image processing techniques
Wang, Feng. "Adaptive fuzzy network with application to neural prosthetic control, a computer simulation study." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0028/MQ40121.pdf.
Повний текст джерелаLura, Derek James. "The Creation of a Robotics Based Human Upper Body Model for Predictive Simulation of Prostheses Performance." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4133.
Повний текст джерелаSullins, Tyler Kayne. "The Development of a Prosthetic Training Software for Upper Limb Amputees." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6406.
Повний текст джерелаBallit, Abbass. "Design and manufacturing process optimization for prosthesis of the lower limb." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2589.
Повний текст джерелаThe prosthetic socket, an essential interface element between the patient's stump and prosthetic device, is most often the place where the degree of prosthetic success is defined. It is the most critical part of the prosthesis, customized to fit with the unique residual limb of the amputee. Without a proper socket shape and fit, the prosthesis becomes uncomfortable, or even unusable, and causes pain and skin issues. The state-of-the-art prosthetic production is still missing universal numerical standards to design a socket. The current practice is expensive and relies on the manual refinements of the orthopedic technician, and the fit quality strictly correlates with his skills as well as the subjective feedback of the patient. The thesis aims to conduct a deep analysis of an optimal design of the prosthetic socket by studying and developing an alternative computer-aided design process. This process is fully based on the virtual model of the patient’s residual limb and relies on the calculation of the socket-stump interaction. A fast calculation is favorable in this case, that’s why we propose to use the Mass-Spring System (MSS) instead of the widely used FE method to model the soft tissues of the residual limb. A new configuration of the MSS model is proposed to respect the non-compressibility property of the soft tissues by adding non-linear “Corrective Springs”. The numeric model is to be generated from the scanned model of the stump. For this purpose, we propose a fusion scheme of four RGB-Depth sensors for a rapid and low-cost scan with error reduction techniques. Finally, the virtual residual limb is used in the socket designing phase. A parametric design method is proposed and investigated. The design problem is transformed into a constraint-satisfaction-problem whose constraints are derived from the inverse calculation of the stump-socket interaction. The inverse approach has been chosen to eliminate the need for expensive contact formulation. This fact leads to rapid calculations, and consequently, allows to provide real-time numerical feedback during the designing process. The validation was done by comparing the results of our system with the output of FE simulations. The system has been implemented with a user-friendly graphical interface and virtually tested and numerically validated. This system reduces the limitations of the current practices. However, a lot of works is still ahead to refine and develop the system and validate it with clinical experiments
Sari-ali, Elhadi. "Experimental and computational simulation of micro-separation and its effect on ceramic-on-ceramic total hip prostheses." Thesis, University of Leeds, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515789.
Повний текст джерелаKeggen, Linda Anne. "Simulation techniques to study the potential for flow related thrombus deposition on prosthetic heart valves." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388707.
Повний текст джерелаHallum, Luke Edward Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "Prosthetic vision : Visual modelling, information theory and neural correlates." Publisher:University of New South Wales. Graduate School of Biomedical Engineering, 2008. http://handle.unsw.edu.au/1959.4/41450.
Повний текст джерелаDowling, Jason Anthony. "Mobility enhancement using simulated artificial human vision." Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16380/1/Jason_Dowling_Thesis.pdf.
Повний текст джерелаDowling, Jason Anthony. "Mobility enhancement using simulated artificial human vision." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16380/.
Повний текст джерелаSushko, John. "Asymmetric Passive Dynamic Walker Used to Examine Gait Rehabilitation Methods." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3373.
Повний текст джерелаChun, Eliseo Pablo [UNESP]. "Análise microestrutural e da resistência à fadiga de zircônia monolítica submetida a protocolos de ajuste simulado." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150134.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O objetivo deste trabalho foi investigar as propriedades microestruturais e a resistência à fadiga de amostras de zircônia parcialmente estabilizada por óxido de ítrio (Y-TZP) para uso em forma monolítica (Vita YZ HT, Vita Zahnfabrik, Alemanha) após diferentes protocolos de ajuste clínico simulado. 162 discos de Y-TZP HT (12 mm de diâmetro, 0,8 mm de altura) foram confeccionados e aleatoriamente divididos em 6 grupos de acordo com as simulações (n=27): S- Y-TZP sinterizada (sem desgaste, sem glaze); G- Y-TZP sinterizada (sem desgaste) e glazeada; PdG- ajuste simulado da Y-TZP com ponta diamantada seguido por aplicação de glaze; GPd- ajuste simulado com ponta diamantada da Y-TZP já glazeada; PdBdG- ajuste simulado com ponta diamantada, seguido por borracha diamantada e aplicação do glaze; GPdBd- ajuste simulado com ponta diamantada, seguido por borracha diamantada da Y-TZP já glazeada. Após teste monotônico sob flexão biaxial (n=3, célula de carga de 1000 kgf, velocidade de 1 mm/min), os espécimes restantes foram distribuídos na proporção 3:2:3 e testados sob fadiga acelerada (step stress) em três perfis de carregamento (leve, moderado e agressivo), variando-se os incrementos de carga e número de ciclos. Os espécimes representativos fraturados foram avaliados em estereomicroscopio e microscópio eletrônico de varredura (MEV) e as características microestruturais das superfícies obtidas com os diferentes protocolos foram analisadas quanto a difração de raios-X, rugosidade média (Ra), perfilometria e MEV. Os dados de sobrevivência ou fratura foram utilizados para cálculo do valor beta (β) de Weibull e da confiabilidade para missões de 300.000 e 600.000 ciclos a 200 N. Os espectros obtidos pela difração foram comparados com espectros padrão de bancos de dados. Os dados de Ra foram analisados estatisticamente por ANOVA 1 fator e teste de Tukey (ambos, a=5%). As imagens foram analisadas qualitativamente e descritas. Não houve alteração significativa na cristalografia da zircônia após as simulações de ajuste clínico. A zircônia HT não tratada (S) apresentou menor probabilidade de sobrevivência, após 600.000 ciclos a 200 N, em comparação com a Y-TZP HT desgastada com ponta diamantada e glazeada (PdG) e após o polimento final com borracha diamantada (GPdBd). Apesar dos protocolos de ajuste simulado não alterarem a cristalografia da zircônia, o polimento final com borracha diamantada (GPdBd) resultou em uma superfície mais homogênea em comparação com amostras glazeadas (G, PdG e PdBdG). O glaze se acumulou em “ilhas” sobre todas as superfícies analisadas. Concluiu-se que a Y-TZP HT tem maior probabilidade de sobrevivência quando glazeada após desgaste com ponta diamantada (PdG) ou com polimento finalizado por borrachas diamantadas (GPdBd).
The objective of this study was to investigate the microstructural properties and fatigue resistance of zirconia partially stabilized by yttrium oxide (Y-TZP) for use in monolithic form (Vita YZ HT, Vita Zahnfabrik, Germany) after different clinical adjustment protocols simulation. 162 disc of Y-TZP HT (12 mm diameter, 0.8 mm high) were made and randomly divided into 6 groups according to the adjustment protocol (n = 27): S- Y-TZP as sintered (without adjustment and glaze); G- glazed Y-TZP (without adjustment); PdG- Y-TZP with adjustment simulation procedure with diamond bur followed by glaze application; GPd- glazed Y-TZP followed by adjustment simulation procedure with diamond bur; PdBdG- Y-TZP with adjustment simulation procedure with diamond bur and polishing kit, followed by glaze application; GPdBd- glazed Y-TZP with adjustment simulation procedure with bur followed by polishing kit. After monotonic testing under biaxial flexure (n=3, 1000 kgf load cell, 1 mm/min speed), the remaining specimens were distributed into 3:2:3 ratio and tested under step-stress in three profiles (light, moderate and aggressive), varying the load, increments and number of cycles. The fractured representative specimens were evaluated in a stereomicroscope and scanning electron microscope (SEM) and the microstructural characteristics of the surfaces obtained with different protocols were analyzed by X-ray diffraction, mean roughness (Ra), profilometry and SEM. Survival or fracture data were used to calculate Weibull's beta (β) value and reliability for 300,000 and 600,000 cycles at 200 N. The spectra obtained by the diffraction were compared with standard spectra from databases. Ra data were statistically analyzed by 1-way ANOVA and Tukey’s test (both, a=5%). The images were analyzed and qualitatively described. There was no significant change in zirconia crystallography after the simulations of clinical adjustment. The untreated Y-TZP HT (S) presented a lower probability of survival after 600,000 cycles at 200 N, compared to Y-TZP HT adjusted with diamond bur and glazed (PdG). and after final polishing with polishing kit (GPdBd). Although the simulated adjustment protocols did not alter the crystallography of the Y-TZP HT, the final polishing with diamond rubber (GPdBd) resulted in a more homogeneous surface compared to glazed samples (G, PdG and PdBdG). The glaze was accumulated in "islands" on all analyzed surfaces. It could be concluded that Y-TZP HT is more likely to survive when glazed after diamond adjustments (PdG) or when it is finished with polishing kit (GPdBd).
Chien, Chih-Hao. "POTENTIAL OPTIMAL GAIT PERFORMANCE OF MAUCH S-N-S PROSTHETIC KNEE CONFIGURATIONS AS PREDICTED BY DYNAMIC MODELING." Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1417068842.
Повний текст джерелаDrapeau, Guy. "Comparative numerical study of the intra-vessel flow characteristics between a flat and a cylindrical configuration in a stented wall region." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112566.
Повний текст джерелаThe spatial and temporal distribution of the Wall Shear Stress (WSS), which is believed to be of primary importance in the development of restenosis should be comparable between the flat and the cylindrical stent configuration models. The velocity and shear strain rate distributions will be compared between the flat and cylindrical stent configurations using computational fluid dynamics (CFD) simulations in order to analyse the feasibility of using a flat instead of a cylindrical version of the stent model for PIV experiments. It will be shown that for a physiological pulsatile flow the flat model yields results in shear strain rate spatial and temporal distribution that is comparable to the cylindrical model. A more PIV compatible, efficient and less refractive error prone validated flat model would be advantageous when several stent designs influence on the local hemodynamics around the strut geometries have to be studied quantitatively and optimized.
Jedenmalm, Anneli. "Assessment of acetabular cup wear with computed tomography and influence of surface roughness on wear of materials for hip prostheses." Licentiate thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4157.
Повний текст джерелаVan, Schalkwyk Etienne P. "Determining femoral component goodness-of-fit using computer segmentation and numerical simulation." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4320.
Повний текст джерелаENGLISH ABSTRACT: The c2 goodness-of-fit (GOF) test was used to determine which standard femoral component would achieve the best geometrical fit for a specific patient. This was done by creating 3D models from computerized tomography scan data through computer segmentation using Materialise MIMICS. The second step was to measure the morphological dimensions of the distal femur whereof twelve were selected and compared to the dimensions of two commercial femoral prosthesis designs. Thirdly, cadaveric femurs were scanned with a 3D desktop scanner to create a database with the dimensions of healthy knees. The 3D model database of the cadaveric femurs included cartilage layer. A cartilage thickness was added to the CT knee dimensions using a self-organizing map (SOM) calculation based on the healthy knee database. The developed method calculated alignment angles with higher accuracy than presently used and determined preoperatively which size to implant. Kinematic simulations of total knee arthroplasty (TKA) knees were compared to normal knee simulations created in LifeMOD. The articulating surface was the only variable changed between the two simulations and the kinematics of different sizes were evaluated. A method was created to scale the femoral component using the standard available sizes. The completed project will be used as foundation for customization of TKA prostheses.
AFRIKAANSE OPSOMMING: Die c2 graad van passing toets metode was gebruik om te bereken watter standaard femorale komponent ’n patiënt die beste geometries pas. Dit was gedoen deur eerstens 3D modelle gemaak vanaf CT skandeer data deur rekenaar segmentasie met Materialise MIMICS. Daarna was morfologiese dimensies gemeet vanaf die distale femur, waarvan twaalf gekies en vergelyk was teen two kommersiële femorale prostesis ontwerpe. Laastens was kadawer femurs geskandeer met ‘n 3D skandeerder om ’n databasis van gesonde knieë te maak. Die 3D modelle van die kadawer bene het die kraakbeen laag bevat. Die kraakbeen dikte was by die CT knie dimensies gevoeg d.m.v. SOM en die gesonde knie databasis. Die nuwe metode bereken die belynings hoeke met hoër akkuraatheid as wat huidiglik gebruik word en bereken voor die operasie watter grote om te gebruik. Kinematiese simulasies van knie prostesis was vergelyk met ’n normale knie simulasies gemaak in LifeMOD. Die artikulêre oppervlakte was die enigste veranderlike tussen die twee simulasies en kinematika van verskillende grotes was ondersoek. ‘n Metode was geskep om die standaard femorale komponent se skaal te verander vir ’n beter passing.
Chun, Eliseo Pablo. "Análise microestrutural e da resistência à fadiga de zircônia monolítica submetida a protocolos de ajuste simulado /." São José dos Campos, 2017. http://hdl.handle.net/11449/150134.
Повний текст джерелаCoorientadora: Lilian Costa Anami
Banca: Guilherme de Siqueira Ferreira Anzaloni Saavedra
Banca: Fernanda Campos
Resumo: O objetivo deste trabalho foi investigar as propriedades microestruturais e a resistência à fadiga de amostras de zircônia parcialmente estabilizada por óxido de ítrio (Y-TZP) para uso em forma monolítica (Vita YZ HT, Vita Zahnfabrik, Alemanha) após diferentes protocolos de ajuste clínico simulado. 162 discos de Y-TZP HT (12 mm de diâmetro, 0,8 mm de altura) foram confeccionados e aleatoriamente divididos em 6 grupos de acordo com as simulações (n=27): S- Y-TZP sinterizada (sem desgaste, sem glaze); G- Y-TZP sinterizada (sem desgaste) e glazeada; PdG- ajuste simulado da Y-TZP com ponta diamantada seguido por aplicação de glaze; GPd- ajuste simulado com ponta diamantada da Y-TZP já glazeada; PdBdG- ajuste simulado com ponta diamantada, seguido por borracha diamantada e aplicação do glaze; GPdBd- ajuste simulado com ponta diamantada, seguido por borracha diamantada da Y-TZP já glazeada. Após teste monotônico sob flexão biaxial (n=3, célula de carga de 1000 kgf, velocidade de 1 mm/min), os espécimes restantes foram distribuídos na proporção 3:2:3 e testados sob fadiga acelerada (step stress) em três perfis de carregamento (leve, moderado e agressivo), variando-se os incrementos de carga e número de ciclos. Os espécimes representativos fraturados foram avaliados em estereomicroscopio e microscópio eletrônico de varredura (MEV) e as características microestruturais das superfícies obtidas com os diferentes protocolos foram analisadas quanto a difração de raios-X, rugosidade média ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective of this study was to investigate the microstructural properties and fatigue resistance of zirconia partially stabilized by yttrium oxide (Y-TZP) for use in monolithic form (Vita YZ HT, Vita Zahnfabrik, Germany) after different clinical adjustment protocols simulation. 162 disc of Y-TZP HT (12 mm diameter, 0.8 mm high) were made and randomly divided into 6 groups according to the adjustment protocol (n = 27): S- Y-TZP as sintered (without adjustment and glaze); G- glazed Y-TZP (without adjustment); PdG- Y-TZP with adjustment simulation procedure with diamond bur followed by glaze application; GPd- glazed Y-TZP followed by adjustment simulation procedure with diamond bur; PdBdG- Y-TZP with adjustment simulation procedure with diamond bur and polishing kit, followed by glaze application; GPdBd- glazed Y-TZP with adjustment simulation procedure with bur followed by polishing kit. After monotonic testing under biaxial flexure (n=3, 1000 kgf load cell, 1 mm/min speed), the remaining specimens were distributed into 3:2:3 ratio and tested under step-stress in three profiles (light, moderate and aggressive), varying the load, increments and number of cycles. The fractured representative specimens were evaluated in a stereomicroscope and scanning electron microscope (SEM) and the microstructural characteristics of the surfaces obtained with different protocols were analyzed by X-ray diffraction, mean roughness (Ra), profilometry and SEM. Survival or fracture data were used to calculate Weibull's beta (β) value and reliability for 300,000 and 600,000 cycles at 200 N. The spectra obtained by the diffraction were compared with standard spectra from databases. Ra data were statistically analyzed by 1-way ANOVA and Tukey's test (both, a=5%). The images were analyzed and qualitatively described. There was no significant change in zirconia crystallography ....(Resumo completo, clicar acesso eletrônico abaixo)
Mestre
Narang, Yashraj S. (Yashraj Shyam). "Identification of design requirements for a high-performance, low-cost, passive prosthetic knee through user analysis and dynamic simulation." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82357.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references.
In January 2012, a partnership was initiated between the Massachusetts Institute of Technology and Bhagwan Mahaveer Viklang Sahayata Samiti (BMVSS, a.k.a., Jaipur Foot) to design a high-performance, low-cost, passive prosthetic knee for transfemoral amputees in India. The knee was primarily intended to improve the walking gait of amputees relative to existing low-cost devices. This thesis aimed to identify detailed design requirements for the prosthetic knee through user analysis and dynamic simulation. User analysis identified the needs and constraints of numerous stakeholders in the prosthesis development process. Members of the Indian biomechanics, prosthetics, and rehabilitation communities were interviewed to identify general requirements for the design, manufacturing, evaluation, and fitting of a prosthetic knee, and a structured survey of Indian amputees was conducted to quantify the demographics, functional capabilities, and functional needs of future end users. Dynamic simulation identified methods to enable transfemoral amputees to walk with reduced energy expenditure and normative gait kinematics. 2-dimensional inverse dynamics simulations were used to calculate the effects of inertial alterations of a prosthetic leg on the energy expenditure required to walk with normative kinematics. In addition, simulations were performed to compute the effects of inertial alterations on the knee moment required to walk with normative kinematics. Mechanical power analysis, sensitivity analysis, and optimization were used to formulate a passive mechanical model that could accurately reproduce the specified knee moment. The effects of walking cadence on critical results were also examined. Through the identification of user-centered and biomechanical requirements, the thesis provides a blueprint for the mechanism design comprising the next phase of the project.
by Yashraj S. Narang.
S.M.
Vergnieux, Victor. "Naviguer en vision prothétique simulée : apport de la vision par ordinateur pour augmenter les rendus prothétiques de basse résolution." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30323/document.
Повний текст джерелаBlindness affects thirty nine millions people in the world and generates numerous difficulties in everyday life. Specifically, navigation abilities (which include wayfinding and mobility) are heavily diminished. This leads blind people to limit and eventually to stop walking outside. Visual neuroprosthesis are developed in order to restore such "visual" perception and help them to get some autonomy back. Those implants generate electrical micro-stimulations which are focused on the retina, the optic nerve or the visual cortex. Those stimulations elicit blurry dots called "phosphenes". Phosphenes can be mainly white, grey or yellow. The whole stimulation device contains a wearable camera, a small computer and the implant which is connected to the computer. The implant resolution and position impact directly the quality of the restored visual perception. Current implants include less than a hundred electrodes so it is mandatory to reduce the resolution of the visual stream to match the implant resolution. For instance, the already commercialized Argus II implant from the company Second Sight (Seymar, California) is the leading visual implant worldwide and uses only sixty electrodes. This means that Argus II blind owners can perceive only sixty phosphenes simultaneously. Therefore this restored vision is quite poor and signal optimization is required to get to a functional implant usage. Blind people with implants are involved in restricted clinical trials and are difficult to reach. Yet, studying those implant possibilities is at our reach by simulating prosthetic vision and displaying it in a head mounted display for sighted subjects. This is the field of simulated prosthetic vision (SPV). Navigation was never studied with people with implant, and only a few studies approached this topic in SPV. In this thesis, we focused on the study of navigation in SPV. Computer vision allowed us to select which of the scene elements to display in order to help subjects to navigate and build a spatial representation of the environment. We used psychological models of navigation to conceive and evaluate SPV renderings. Subjects had to find their way and collect elements in a navigation task in SPV inspired by video games for the blind. To evaluate their performance we used a performance index based on the completion time. To evaluate their mental representation, we asked them to draw the environment layout after the task for each rendering. This double evaluation lead us to spot which elements can and should be displayed in low resolution SPV in order to navigate. Specifically those results show that to be understandable in low vision, a scene must be simple and the structure of the environment should not be hidden. When blind people with implant will become available we will be able to confirm or deny those results by evaluating their navigation in virtual and real environments
Hasan, Istabrak [Verfasser]. "Computational Simulation of Trabecular Bone Distribution around Dental Implants and the Influence of Abutment Design on the Bone Reaction for Implant-Supported Fixed Prosthesis / Istabrak Hasan." Bonn : Universitäts- und Landesbibliothek Bonn, 2011. http://d-nb.info/1016151403/34.
Повний текст джерелаDe, Jongh Cornel. "Critical evaluation of predictive modelling of a cervical disc design." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/601.
Повний текст джерелаGiovannelli, Luca. "Direct creation of patient-specific Finite Element models from medical images and preoperative prosthetic implant simulation using h-adaptive Cartesian grids." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/113644.
Повний текст джерелаEs creu que la medicina in silico suposarà un dels canvis més disruptius en el futur pròxim. Al llarg de l'última dècada, s'ha invertit un gran esforç en el desenvolupament de models computacionals predictius per millorar el poder de diagnòstic dels metges i l'efectivitat de les teràpies. Un punt clau d'aquesta revolució, serà la personalització, que comporta en la majoria dels casos la creació de models computacionals específics de pacient. Aquesta pràctica està actualment estesa en la investigació i hi ha al mercat diversos software que permeten obtenir models a partir d'imatges. Tot i això, per a poder-se utilitzar en la pràctica clínica aquests métodes es necessita reduir dràsticament el temps i el treball humà necessaris per a la seva creació. Aquesta tesi es centra en la proposta d'una versió basada en imatges del Cartesian grid Finite Element Method (cgFEM), una técnica per obtenir de forma automàticament models a partir d'imatges i dur a terme anàlisis estructurals lineals d'ossos, implants o materials heterogenis. Després de relacionar l'escala del imatge a propietats macàniques corresponents, s'usa tota la informació continguda en els píxels per a integrar les matrius de rigidesa dels elements que homogeneïtzen el comportament elàstic dels grups de píxels continguts en cada element. Es emphh-adapta una malla inicialment uniforme a les característiques de la imatge usant un procediment eficient que té en compte les propietats elàstiques locals associades als valors dels píxels. Amb això, s'evita un suavitzat excessiu de les propietats elàstiques a causa de la integració dels elements en àrees altament heterogénies, però, tot i això, s'obtenen models finals amb un nombre raonable de graus de llibertat. El resultat d'aquest procés és una malla no conforme en la qual s'imposa la continuïtat C0 de la solució mitjançant restriccions multi-punt en els hanging nodes. Contràriament als procediments estàndard per a la creació de models d'Elements finits a partir d'imatges, que normalment requereixen la definició completa i watertight de la geometria i tracten el resultat com un CAD estàndard, amb cgFEM no cal definir cap entitat geométrica. No obstant això, és immediat incloure-les en el model en el cas que sigui necessari, com ara superfícies suaus per imposar condicions de contorn de forma més precisa o volums CAD de dispositius per a la simulació d'implants. Com a conseqüéncia d'això, la quantitat de treball humà per a la creació de models es redueix dràsticament. En aquesta tesi, s'analitza en detalls el comportament del nou métode en problemes 2D i 3D a partir de CT-scan i radiografies sintétiques i reals, centrant-se en tres classes de problemes. Aquestes inclouen la simulació d'ossos, la caracterització de materials a partir de TACs, per a la qual s'ha desenvolupat la cgFEM virtual characterisation technique, i l'anàlisi estructural de futurs implants, aprofitant la capacitat del cgFEM de combinar fàcilment imatges i models de CAD.
In silico medicine is believed to be one of the most disruptive changes in the near future. A great effort has been carried out during the last decade to develop predicting computational models to increase the diagnostic capabilities of medical doctors and the effectiveness of therapies. One of the key points of this revolution, will be personalisation, which means in most of the cases creating patient specific computational models, also called digital twins. This practice is currently wide-spread in research and there are quite a few software products in the market to obtain models from images. Nevertheless, in order to be usable in the clinical practice, these methods have to drastically reduce the time and human intervention required for the creation of the numerical models. This thesis focuses on the proposal of image-based Cartesian grid Finite Element Method (cgFEM), a technique to automatically obtain numerical models from images and carry out linear structural analyses of bone, implants or heterogeneous materials. In the method proposed in this thesis, after relating the image scale to corresponding elastic properties, all the pixel information will be used for the integration of the element stiffness matrices, which homogenise the elastic behaviour of the groups of pixels contained in each element. An initial uniform Cartesian mesh is h-adapted to the image characteristics by using an efficient refinement procedure which takes into account the local elastic properties associated to the pixel values. Doing so we avoid an excessive elastic property smoothing due to element integration in highly heterogeneous areas, but, nonetheless obtain final models with a reasonable number of degrees of freedom. The result of the process is non-conforming mesh in which C0 continuity is enforced via multipoint constraints at the hanging nodes. In contrast to the standard procedures for the creation of Finite Element models from images, which usually require a complete and watertight definition of the geometry and treat the result as a standard CAD, with cgFEM it is not necessary to define any geometrical entity, as the procedure proposed leads to an implicit definition of the boundaries. Nonetheless, they are straightforward to include in the model if necessary, such as smooth surfaces to impose the boundary conditions more precisely or CAD device volumes for the simulation of implants. As a consequence, the amount of human work required for the creation of the numerical models is drastically reduced. In this thesis, we analyse in detail the new method behaviour in 2D and 3D problems from CT-scans and X-ray images and synthetic images, focusing on three classes of problems. These include the simulation of bones, the material characterisation of solid foams from CT scans, for which we developed the cgFEM virtual characterisation technique, and the structural analysis of future implants, taking advantage of the capability of cgFEM to easily mix images and CAD models.
Giovannelli, L. (2018). Direct creation of patient-specific Finite Element models from medical images and preoperative prosthetic implant simulation using h-adaptive Cartesian grids [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/113644
TESIS
Lamb, Christopher John. "Computer simulation of the action of a mechanical prosthetic heart valve and investigation of aortic flow field characteristics by magnetic resonance velocimetry." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312718.
Повний текст джерелаDelventhal, Brooke. "Simulation-Based Stability Tests in Total Knee Arthroplasty: Are Component Alignment, KneeLaxity, and Tibiofemoral Contact Forces Related?" The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574422948246589.
Повний текст джерелаWarner, Holly E. "Simulation and Control at the Boundaries Between Humans and Assistive Robots." Cleveland State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=csu1577719990967925.
Повний текст джерелаBurkett, Brendan J. "A biomechanical analysis of running for trans-femoral amputees." Thesis, Queensland University of Technology, 1998. https://eprints.qut.edu.au/36739/1/36739_Digitised%20Thesis.pdf.
Повний текст джерелаGirod, Loïc. "Développement et modélisation d'éléments de prothèse pour la main." Thesis, Nancy 1, 2010. http://www.theses.fr/2010NAN10076/document.
Повний текст джерелаAs any functional joint, the proximal interphalangeal joint (PIP) is the target of hurts or of pathologies which can compromise the global functions of the hand. The main objectives of a digital arthroplasty are to restore the function and the stability of the joint and to reduce or suppress the pain in a long-lasting way. The present work of thesis concerns the development and the modeling of two concepts of PIP prostheses: a semiconstrained prosthesis made of nickel-titanium alloy and a resurfacing prosthesis. Besides the work of sizing, fatigue and wear tests are done on both implants. Additional studies are presented for each concept. First, we focus on the shaping and the heat treatments of the semi-constrained prosthesis accompanied with a study nickel ion release and an investigation on the involved mechanisms. Eventually, a finite element modeling of the interaction between the prosthesis and the surrounding bone is presented to estimate the primary stability of implants
Лозінський, Владислав Валентинович. "Моделювання звукопровідної системи середнього вуха людини в Comsol". Master's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/33851.
Повний текст джерелаThe study of the auditory properties of the human auditory system is an urgent problem today, because healthy hearing is the key to a normal life. Among the objective methods, such as impedancemetry, research is performed using a pneumatic system, which makes it impossible to perform the procedure for infants. That is why the study is based on an echo spectrometer, which is an improved objective method without the use of a pneumatic system and with a simple measurement and processing procedure to expand the age group and improve the accuracy of the results. With a wide range of opportunities for the diagnosis of hearing, almost nothing is known about the acoustic characteristics of the human sound system, for decades, scientists have been studying the middle ear. The use of prostheses for the reconstruction of the ear in case of damage to its hearing organs has also become widely used. However, it is difficult to say how effective these methods are. Therefore, this work is devoted to modeling the sound conduction system, substitute, comparing these models and evaluating the effectiveness of the proposed method of hearing diagnosis. The main task is to obtain the transmittance, which will answer the question of how the sound system behaves and how effective prostheses are for the reconstruction of hearing.
内藤, 尚., 和徳 長谷, 剛伸 井上, 孝訓 相川, 伸也 山崎, 基. 諏訪, 五郎 大日方 та ін. "神経・筋骨格系を有する3次元股義足歩行シミュレーションモデルの開発". バイオメカニズム学会, 2005. http://hdl.handle.net/2237/10875.
Повний текст джерелаHannoun, Amira. "Tribological role of pyrocarbon in articular cartilage regeneration. Application in the shoulder arthroplasty." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI025.
Повний текст джерелаDegenerative shoulder pathologies are currently treated by total shoulder arthroplasty (joint replacement) or hemiarthroplasty. Despite the success of this treatment, the complication rate reaches 22 % due to the complex nature of joint mechanics and limited bone stock. In this context, for young patients with degenerative glenohumeral joints, a new generation of interposition implant has been developed. The implant, designed with an original spherical shape, is inserted without fixation between the glenoid cartilage and a surgically created humeral bone cavity. Cobalt-chromium (CoCr) is the most used biomaterial in shoulder arthroplasty; however, Pyrocarbon (PyC) is selected for the new implant for its elastic modulus similar to that of cortical bone. Short-term clinical results showed minimal bone and cartilage wear and good bone remodelling in contact with the implant. However, the origin of these results is not yet well understood. In this framework, the previous study on human explants in the laboratory showed that humeral bone remodelling involves the synthesis of a neocartilaginous tissue, which partly explains the favourable clinical results. However, these results are more controversial on the scapula side because of cartilage erosion. Therefore, the effect of PyC and the geometry of the implant on the remodelling of the surrounding tissues need investigation. Thus, this thesis aims to understand the origin of tissue remodelling on the bone and cartilage side. The first step of our strategy is to carry out three parallel studies to dissociate the role of the biology (cellular response), the impact of the material (PyC vs CoCr), and the involvement of mechanical stresses transmission (living tribological triplet). The second step is to validate the results thus obtained by associating the different aspects in an in vitro model based on tissue bioengineering principles. Consequently, our methodology was based on 1) the expertise of retrieved explants; 2) the analysis of murine primary chondrocytes cultures in contact with PyC and CoCr; 3) the testing of in vitro biotribological simulations; and 4) the design and validation of a simulator allowing to combine the biological, physicochemical and tribological results obtained previously. The final results showed better chondrogenic and osteogenic cell activity in the case of PyC compared to CoCr. They were correlated on the one hand with better adsorption of the lubricating molecules, phospholipids, on the surface of PyC and the other hand with an optimal transmission of the mechanical stress due to its properties and geometry. Furthermore, the in vivo control of transmission of mechanical stresses is essential to guarantee good results in the long term. Besides, this thesis opens up fresh perspectives on the control of this transmission through biomaterials and their geometries for cartilage regeneration
Araujo, Carlos Eduardo de. "Implante neural controlado em malha fechada." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1687.
Повний текст джерелаOne of the challenges to biomedical engineers proposed by researchers in neuroscience is brain machine interaction. The nervous system communicates by interpreting electrochemical signals, and implantable circuits make decisions in order to interact with the biological environment. It is well known that Parkinson’s disease is related to a deficit of dopamine (DA). Different methods has been employed to control dopamine concentration like magnetic or electrical stimulators or drugs. In this work was automatically controlled the neurotransmitter concentration since this is not currently employed. To do that, four systems were designed and developed: deep brain stimulation (DBS), transmagnetic stimulation (TMS), Infusion Pump Control (IPC) for drug delivery, and fast scan cyclic voltammetry (FSCV) (sensing circuits which detect varying concentrations of neurotransmitters like dopamine caused by these stimulations). Some softwares also were developed for data display and analysis in synchronously with current events in the experiments. This allowed the use of infusion pumps and their flexibility is such that DBS or TMS can be used in single mode and other stimulation techniques and combinations like lights, sounds, etc. The developed system allows to control automatically the concentration of DA. The resolution of the system is around 0.4 µmol/L with time correction of concentration adjustable between 1 and 90 seconds. The system allows controlling DA concentrations between 1 and 10 µmol/L, with an error about +/- 0.8 µmol/L. Although designed to control DA concentration, the system can be used to control, the concentration of other substances. It is proposed to continue the closed loop development with FSCV and DBS (or TMS, or infusion) using parkinsonian animals models.
Poujade, Mylène. "Apport des dispositifs de restauration de la vision et de la résolution temporelle." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS319.
Повний текст джерелаRetinitis Pigmentosa is an inherited retinal degenerative disease leading to blindness. Vision restoration techniques have been developed as visual neuroprostheses and optogenetic therapy. The limitation of these devices is their spatial resolution. The visual neuroprosthesis IRIS I developed by Pixium vision and Gensight Biologics’ optogenetic therapy allow the visual information to be captured and stimuled with a high temporal resolution. Increasing the temporal resolution leads to a more natural vision, and should overcome the low spatial resolution. Our study evaluate the contribution to these techniques and the temporal resolution, towards usefull vision. Healthy subjects wearing goggles simulating vision arising from the devices were asked to perform everyday tasks at 60Hz and 1440Hz. The devices allow the tasks to be carried out, with greater ease for patients who would be treated with optogenetic therapy. Patients could then regain autonomy in performing daily tasks. We also show that the quality of stimulation influences tasks requiring relatively sharpness. We have not identified any facilitation in the accomplishment of these tasks through increased temporal resolution. According to the literature, an improvement in visual perception should accompany the increase in temporal resolution. As such, we set up a parametric study of the temporal frequency through a task of directional discrimination at three different speeds. From 120 Hz, the temporal resolution facilitates the task at medium and high speed. Based on these results, speeds of the visual scenes from our previous experiment were too low for temporal resolution to improve the perception
Alleau, Thibaut. "Development of a numerical platform to model the mitral valve." Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2649.
Повний текст джерелаMitral insufficiency is the first valvular disease worldwide, with a 2% prevalence. When open-heartsurgery is impossible for the patient, surgeons use percutaneous devices to help the mitral leaflets coapt. However, the only device currently available is based on the edge-to-edge mitral valve repair technique. This type of implant is not adapted for patients suffering from functional mitral insufficiency, where the ventricle is responsible for the lack of coaptation of the leaflets. This thesis aims to provide a numerical platform to help the development of a mitral valve implant adapted for those patients. Several mitral valve geometries were created from a parametric model using anatomical measurements. Finite element simulations of the mitral valve were performed using ADINA to determine the valve closure under constant pressure. Several material models were developed in large strain and large deformation to model the valve closure accurately. Pathological behaviour such as annulus dilatation and chordae rupture were modelled, and several methods were tested to implement medical devices. Fluid-structure interaction of a 2D mitral valve was obtained using an ALE description and a monolithic coupling approach. Both the systole and the diastole were reproduced and studied, and the hermetic seal of the valve was detailed. The numerical platform developed is suited to model mitral valve function and can be used to help the development of mitral implants. In addition, the parametric geometry model and the anisotropic material model will be useful to depict with realism the valve function. A 3D fluid-structure interaction of the mitral valve could be developed
Alnu'man, Nasim. "Advanced Simulation of an Adaptive Lower Limb Prosthesis." Phd thesis, 2010. http://tuprints.ulb.tu-darmstadt.de/2149/1/Dissertation_Nasim_Alnuman.pdf.
Повний текст джерелаLai, Y. C., and 賴育誠. "Laboratory Simulation and Assessment of Total Hip Prosthesis on Loosening Problem." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/06523258534424900308.
Повний текст джерела中原大學
醫學工程學系
88
For patients inserted total hip joint prostheses, clinical findings on implant detachment, malfunction, and loosening-associate problems are frequently observed after a period of time. To evaluate various potential factors caused fixation failure, laboratory-assisted assessments are required. Present study using cup-on-ball hip wear simulator approaches to comply with gait analysis of hip, accelerates in-vitro tests by entering maximum angular setting and obtains relative abrasive condition at the interface. Morphologies and concentrations of wear debris may affect the attachment of peri-prosthetic tissues; consequently, this work deals with three main topics: (1) To improve wear resistance of UHMW polyethylene acetabular cup as the bearing part, the load-bearing properties of polyethylene are enhanced by nitrogen ion implantation; the doses with low current density differ from 1013 ions.cm-2 to 1016 ions.cm-2. (2) Wear debris generated from simulator is compared with in vivo particles taken from tissues surrounded the failure implant. (3) Initiation of fixation failure with musculo-skeletal system rises with fluctuations of stress-strain relation at the implant/tissue interface. Because of varied materials’ characteristic at the contact surfaces, relative friction causes mobility between adhesive components and gradual increase of plastic strain, and eventually brings about macro-scale dislocation between implant and surrounding tissues. This study is to propose a possible mechanism, using micro-motion tester to simulate the occurrence of implant displacement at the inserted interface before loosening. Experimental result on the ion-implanted polyethylene has demonstrated that an important surface-hardening transformation at polyethylene surface is found. Using cup-on-ball hip joint simulator, the release rate and the sequence of wear debris are detectable from the accumulated filters varied with testing cycles up to 1.3 M, e.g. weight loss of non-treated polyethylene is ca. 74.7 mg; similarly, for the 1013 ions.cm-2 implanted polyethylene is 17 mg, while for the 1016 ions.cm-2 implanted polyethylene is ca. 8 mg. Wear rate of ion-implanted polyethylene significantly decreases owing to the formation of a hardened (or cross-linked) layer at surface. Analytical result supports that morphologies and concentrations of wear debris vary with testing cycles, which include delaminated species and carbonates from the scission of polyethylene in foam- or plate-like dimension. On the other hand, because of varied materials’ characteristic at the contact surfaces, their bearing capabilities to keep in the elastic region are different. Micro-motion at the fixed interface eventually provokes macro-scale dislocation between implant and surrounding tissues. Present methodology proposes a possible mechanism occurred at the inserted interface before loosening. The parameters used are correlated with Ti-based femoral stem with respect to bone cement; the range of micro-motion is assigned as ±40μm per cycle with constant speed of 0.0014 mm/s, moving forward for 10,000 cycles each, and under a bearing load of 100 N. Experimental result on micro-motion has indicated that boundary friction causes plowing effect and thus reduced contact area; a localized edge effect occurs. Further SEM observations and roughness tests provide that the edge-effected width on bone cement is ca. 80m (due to ±40μm movement each cycle); some 20μm are caused by the accumulation of wear debris. Along partial edge of Ti-base pin, small amount of PMMA particles are adhered. The roughness at both surfaces after micro-motion tests is corresponded to friction-to-wear mechanics. When the inserted stem loses mechanical interlocks with bone cement, a gradual slip at the interface decreases their adherence. The released species may facilitate and accelerate their detachment and diminish the initial elastic range of bone cement. This may create loosening or shrinking effect on the inserted stem. A conclusion for both behaviors suggest that a variation of relative and dynamic interface in use.
Patarata, Vasco Santos. "Structural simulation of 3D limb prostheses using meshless methods." Master's thesis, 2017. https://hdl.handle.net/10216/107686.
Повний текст джерелаPatarata, Vasco Santos. "Structural simulation of 3D limb prostheses using meshless methods." Dissertação, 2017. https://hdl.handle.net/10216/107686.
Повний текст джерела